Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
99.1
100
97
100
98
100
February
98.3
97
94
100
100
99
March
99.4
99
99
100
99
100
April
99.2
97
100
100
99
May
99.9
100
100
100
100
June
99.2
100
95
100
100
July
99.8
100
100
100
100
August
99.3
99
99
97
100
September
99.4
100
98
100
99
October
98.4
100
100
100
100
November
97.9
100
100
100
92
December
91.0
54
99
100
100
Average
98.6
98.6
95.5
99.0
99.3
99.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
13.3
13
11
14
14
14
February
15.5
14
13
17
16
18
March
18.4
17
15
22
18
16
April
25.4
24
25
26
27
May
29.5
29
30
31
31
June
35.6
32
36
38
35
July
39.0
40
39
39
39
August
37.6
35
38
38
39
September
33.2
32
34
34
35
October
25.8
24
27
23
29
November
18.9
18
15
21
19
December
12.5
8
11
12
15
Average
25.0
14.7
23.6
26.1
25.9
26.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
2.1
1
2
1
1
3
February
3.3
4
1
3
3
4
March
5.8
6
4
6
4
6
April
10.8
10
11
11
13
May
14.7
14
14
15
17
June
19.8
18
21
22
18
July
24.0
25
25
24
22
August
22.6
22
24
24
22
September
18.0
17
19
19
18
October
11.2
12
14
10
12
November
5.2
5
3
7
5
December
1.7
1
0
2
1
Average
11.4
3.5
10.8
12.1
11.8
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.5
4
9
0
3
0
February
4.4
13
9
0
1
4
March
2.6
6
7
0
1
1
April
0.7
3
1
0
0
May
1.0
0
0
0
2
June
0.3
1
1
0
0
July
0.7
0
2
1
0
August
1.3
6
1
0
1
September
0.3
1
1
0
0
October
1.1
0
0
7
0
November
1.4
0
1
0
0
December
1.6
0
3
3
1
Average
2.0
7.5
2.7
0.8
1.2
0.7
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
7.9
6
10
9
8
7
February
8.9
7
11
10
9
7
March
9.9
11
10
8
10
10
April
9.9
9
11
9
8
May
9.3
9
10
9
10
June
9.4
9
10
9
9
July
8.3
9
9
7
9
August
7.8
8
7
9
8
September
8.0
8
7
8
7
October
8.0
9
7
8
7
November
8.2
8
10
8
8
December
7.0
4
7
8
8
Average
8.5
7.9
8.6
8.8
8.5
8.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
097°
054°
070°
082°
066°
February
222°
129°
062°
360°
052°
March
203°
205°
044°
196°
208°
April
187°
215°
223°
261°
May
215°
241°
236°
218°
June
211°
216°
214°
222°
July
219°
210°
215°
219°
August
208°
175°
215°
218°
September
203°
207°
213°
199°
October
066°
133°
186°
006°
November
119°
108°
126°
121°
December
113°
175°
173°
070°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.